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Thousands rally against Carlton and United Breweries enterprise agreement

About 3000 protesters have marched through Melbourne to protest a controversial enterprise agreement affecting workers at the Carlton and United Breweries (CUB).

A group of former CUB workers lead the rally from AFL House towards Parliament House, temporarily closing down city streets and threatening a "CUB beer-free footy finals season".

The protest follows the controversial Catalyst Services Enterprise Agreement 2014 being rolled out at the Abbotsford plant in June.

The agreement contained a provision allowing the new contractor to reduce pay to 50 cents above the award at any time, and most of the 55 electricians and fitters affected refused to sign up due to the cut to their wages.

Electrical Trades Union secretary Troy Gray today said the union had told the workers not to re-apply for their jobs as it was a “set-up”.

“This is a loyal maintenance workforce. Their combined years of service totals around 906. They were all sacked on one day, and CUB want them all back but on a 65% reduction. It’s disgraceful and un-Australian,” he said.

One of the retrenched workers, Dominic, said today’s march was about “justice”.

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“It was just wrong. I’ve got bills coming in, two kids, it’s just pressure on the family that we don’t need at the moment,” he said.

A CUB spokeswoman said claims the workers had been sacked was "rubbish". (9NEWS)

Greens MP Adam Bandt told the crowd a “majority of Australians” would be behind them.

“If you can be asked to come back to work on 65 percent of your pay and otherwise you don’t have a job, and that that can happen in the heart of Melbourne, it can happen to anyone,” he said.

A CUB spokeswoman said the suggestion workers had been sacked were untrue.

"Claims CUB sacked 55 workers are rubbish," she said.

"This dispute is about unions wanting to enforce their power over an external company and the wages being offered — the contract roles advertised range between $70,000 and $120,000 before overtime — [are] above award rates.

"We’ve chosen not to take part in a public spat with unions while they’re targeting the brands that keep us, and many of their members at Abbotsford in jobs."